Explosion or combustion motor or pump.



O. A. & O. W. HULT.

EXPLOSION 0R BOMBUSTION MOTOR 0R PUMP. APPLICATION FILED OCT. 11, 1 907.

Patented May 31, 1910.

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EXPLOSION OR COMBUSTION MOTOR OR PUMP.

APPLICATION FILED 0C'I.11.1907.

59 Patented May 31,1910.

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C. A. & 0. W. HULT. EXPLOSION OR COMBUSTION MOTOR OR PUMP.

APPLICATION FILED 001 .11, 1907.

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GARL ALRIK'HULT AND OSCAR WALFRID. HUI/I, 0F STOCKHOLM, SWEDEN.

nxrnosron on ccnnnsrron moron on PUPB seams.

Speoificatipn of Letters Patent.

Patent May 33, 1919.

Application filed October 11, 1907 Serial No. 396,964.

To all whom it may concern:

Be it known that ;we, CARL ALRIK HULT, and OscAR WALFRID' HULT, subjects of-the King of Sweden, and residents of 1 Tnedalsgatan, Stockholm, in the Kingdom of Sweden, engineers, have invented certain new and useful Improvements in Explosion or Combustion Motors or in Pumps, of which the following is a. specification, reference being made to the accompanying drawings.

The present invention relates to an arrangementin explosion or combustion motors or in pumps. The arrangement in question consists chiefly of a recess or an interior construction in the piston or piston wall, said recess or construction forming tracks for the crank pin of the driving shaft or for a part mounted on said pin.

0n the accompanying drawings-there is shown as an example an explosion motor constructed in accordance-with this invention.

Figures 1 and 2 show two vertical sections perpendicular to each other, taken along the lines A-A and B-B in Fig. 3 which showns a horizontal section of the motor, taken along the line C-C in Fig. 2.

The motor shown is a two-cycle motor driven by means of a mixture of a hydrocarbon and previously compressed air. The development of work takes place in the cylinder chamber 2 situated above the piston 1, while the previous compression of the air takes place in a chamber which is formed both; by the frame chamber 3 situated under the piston, and by the cavity or chamber in the piston. The work development chamber, from which the products of combustion escape in the usual manner through an opening t in the cylinder wall," is connected, by means of a passage 5, with the chamber for previous compression, into which the air enters in the usual manner through an opening 6. in the frame. The passage 5 is opened and closed by the piston 1.

A part of the piston wall forms, according to this" invention, an interior construction in the piston, which construction has two horizontal walls 7,.the surfaces of which, that are turned toward each other, form tracks for a disk or roller 8, mounted on the crank pin 10 of the driving-shaft 9. In the present case the crank arm llis completel housed in the interior construction, althoug it '(the crankl arm) can also be situated partly or entirely outside the said construction or the piston.

It is evident, that the crank pin can receive the pressure from the walls 7 directly or by means of an arrangement other than that of a disk or roller.

As is seen, there exists between the interior construction and the opposite part of the piston wall a passage 12, on account of which the whole of the interior of the piston together with the chamber under the piston forms the chamber for the previous compression of the air.

13 is a guide pin screwed into the frame of the motor, a corresponding groove being arranged in the piston for said pin.

This invention facilitates the building of very simple and compact motors occupying a small space. It is evident, that it can'be applied to other motors than two-cycle motors and to pumps. Applied to two-cycle motors in the manner described, the invention has the advantage that no part of the previously compressed air can escape through the bearing of the driving shaft, as is generally the case with two-cycle motors and which causes (in addition to the loss of previously compressed air and} thus of work) the lubricant to*be driven out of the bearing, so that it is diflicult to keep the shaft lubricated. v

Both the chamberssituated at the ends .of the piston can be work development chambers (in which case the piston shown has a bottom in its lower end as well as in the upper one). By this means a double-acting four-cycle motor or a double-acting pump is obtained.

Having now described our invention, what we claim as new and desire to secure by Letters Patent is:

1. In a motor of the character described the combination with a motor casing, of a piston in said casing, the lateral wall of said piston being intact and having no parts thereof projecting outwardly beyond its cylindrical surface, said wall being bent inwardly to form a chamber, and a crank pin having a roller rotatably mounted thereon and designed to operatein the chamber formed in the piston.

2. in a motor of the character described, the combination with a motor casing having its body portion formed in a single piece, of a piston reciprocable in said casing, the

lateral wall of said piston being intact and having no part thereof pro'ecting outwardly beyond its cylindrical sur ace said wall being bent inwardly to form an lnclosed chamber, a crank pin having a art thereof adapted to operate within sai chamber, and an air compression chamber formed at one end of the motor casingbelow one end of said piston.

3. In a motor of the character described, the combination with amotor casing, of a cylindrical piston reciprocable thereln, the lateral wall of said piston being intact and having no part thereof projecting outwardly beyond its cylindrical surface, said wall being bent inwardl to form an inclesed chamber, acrank pin aving a art thereof bearing and operable in said c amber, there being a passage (12) connectin spaces formed at either side of the inward y bent part of the piston wall.

4. In a motor of the'character described, the combination with a motor casing, of a cylindrical piston reciprocable thereln, the lateral wall of said piston being intact and havin no part thereof projecting outwardly beyon its cylindrical surface said wall being bent inwardly to form an inclosed chamber, there being a space in the piston wall on either side of said inwardly bent portion, a passage connecting said spaces, means between the piston and the casing for guiding the former in the latter, and a crank pin having a part the eof operable' in the said chamber.

In witnesswhereof we have hereunto set our hands in presence of two Witnesses.

CARL'ALRIK HULT. OSO AR WALFRID HULT.

Witnesses:

CARL FRJBERG, H. B. OHLSSON. 

